光助芬顿法氧化2-氯苯酚的动力学

2-Chlorophenol oxidation kinetic by photo-assisted Fenton process.

作者信息

Xu Xin-hua, Zhao Wei-rong, Huang Yan-qiao, Wang Da-hui

机构信息

Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, China.

出版信息

J Environ Sci (China). 2003 Jul;15(4):475-81.

PMID:12974307

Abstract

Experimental data are presented to test and validate a kinetic model for the oxidation of 2-chlorophenol wastewater by photo-assisted Fenton process. The data showed that this process had produced good effects under acidic conductions. Up to 90% 2-chlorophenol was removed after 90-minute reaction time with H2O2 of 25% COD(Cr, in), while in UV/H2O2 system only 16.8% 2-chlorophenol was removed after one hour treatment. The optimal pH in this reaction occurred between pH 3.0 and pH 4.0. The reaction kinetics for photo-assisted Fenton process experimented in this research was investigated. Kinetic models were proposed for the treatment of 2-chlorophenol wastewater. The reaction was found to follow the 2nd order. The equations of reaction kinetics are as follows: -d[RH]/dt = K(RH) [RH] [H2O2]0 exp(-K(H2O2) t); -d[COD(Cr)]/dt = K(COD(Cr)) [COD(Cr)] [H2O2]0 exp(-K' t). The prediction of the models was found to be in a good agreement with experimental results, thus confirming the proposed reaction mechanism.

摘要

本文给出了实验数据，以测试和验证光助芬顿法氧化2-氯酚废水的动力学模型。数据表明，该工艺在酸性条件下产生了良好的效果。在25% COD（Cr，进水）的H2O2存在下，反应90分钟后，2-氯酚的去除率高达90%，而在UV/H2O2体系中，处理一小时后，2-氯酚的去除率仅为16.8%。该反应的最佳pH值在3.0至4.之间。研究了本研究中光助芬顿法实验的反应动力学。提出了处理2-氯酚废水的动力学模型。发现该反应符合二级反应。反应动力学方程如下：-d[RH]/dt = K(RH) [RH] [H2O2]0 exp(-K(H2O2) t)；-d[COD(Cr)]/dt = K(COD(Cr)) [COD(Cr)] [H2O2]0 exp(-K' t)。发现模型的预测结果与实验结果吻合良好，从而证实了所提出的反应机理。